The Queensland Government has extended disaster relief and recovery funding to four more local government areas.

The Isaac, Mackay, Scenic Rim and Gold Coast City councils have been added to the growing list.

There are 15 regions across the state that are now eligible for the joint State and Federal assistance.

'Flood barriers'

Rockhampton Mayor Brad Carter says flood barriers will be used to protect critical infrastructure as floodwaters approach the city.

Councillor Carter says the Fitzroy River height is now expected to peak at 7.8 metres early next week.

He says council has asked the State Government for the use of the barriers which are currently held in Brisbane and Townsville.

"The important thing is we're going to make a consideration that this equipment is relocated here and it's brought here early in the event that the highway is cut or there is some delay in getting the equipment here," he said.

"There is an expected rain depression later on this week and over the weekend.

"The impact of local rain and local flooding as a result of the rainfall is an unknown quantity."

Theodore peak

Meanwhile, Banana Shire Mayor John Hooper says flooding at Theodore, south-west of Rockhampton, is not expected to be as bad as first thought.

Councillor Hooper feared the Dawson River's flood peak would reach the town tonight.

But he now says a peak of 12.7 metres is expected on Thursday or Friday.

"The river is rising very slowly at 12.7 - some of the roads will be impacted but not cut around Theodore," he said.

"It really needs to gets to about 13 metres before the town will be affected, even though a couple of properties in Theodore will be affected just before 13 metres.

"It's a better situation than I portrayed this morning."

Central-west

Meanwhile, Blackall-Tambo Mayor Jan Ross says the council is desperately trying to finish a drainage project at Blackall, south-east of Longreach in central-west Queensland, that will cope with stormwater.

There was localised flooding in Blackall after a big storm dumped 127 millimetres in the town in the 24 hours to 9am (AEST).

Councillor Ross says a drainage project is underway, but the constant rain all year has delayed its completion.

"It has been an issue for us all year - the lack of drainage," she said.

"When we live in a semi-arid country town, drainage has not been high on the list of things to do in years gone by.

"It really shows up when you get these events that come once in 150 years."